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y = 3(x + 3)(x +1)identify the vertex of the parabola

User Vineethbc
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7 votes

Answer:

Vertex = (-2,-3).

Step-by-step explanation:

Given the equation of the parabola:


y=3\mleft(x+3\mright)\mleft(x+1\mright)

First, we find the axis of symmetry using the formula:


\begin{gathered} x=(r+s)/(2)\text{ (r and s are the zeros)}\colon r=-3,s=-1 \\ x=(-3-1)/(2) \\ x=-(4)/(2) \\ x=-2 \end{gathered}

Next, determine the value of y at x=-2:


\begin{gathered} y=3\mleft(x+3\mright)\mleft(x+1\mright) \\ y=3\mleft(-2+3\mright)\mleft(-2+1\mright) \\ =3(1)(-1) \\ y=-3 \end{gathered}

Thus. the vertex of the parabola is (x,y)=(-2,-3).

User The Fool
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